ce2e751555
I don't actually think this is worthwhile, but I figured
I would check it in before reverting it, so that it can
be in the revision history.
Pros:
* curproc doesn't need to turn on/off interrupts
* scheduler doesn't have to edit curproc anymore
Cons:
* it's ugly
* all the stack computation is more complicated.
* it doesn't actually simplify anything but curproc,
and even curproc is harder to follow.
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
#include "types.h"
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#include "defs.h"
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#include "param.h"
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#include "mmu.h"
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#include "proc.h"
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#include "x86.h"
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static void bootothers(void);
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static void mpmain(void) __attribute__((noreturn));
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// Bootstrap processor starts running C code here.
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int
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main(void)
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{
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int bcpu, i;
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extern char edata[], end[];
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// clear BSS
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memset(edata, 0, end - edata);
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// pushcli() every processor during bootstrap.
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for(i=0; i<NCPU; i++)
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cpus[i].ncli = 1; // no interrupts during bootstrap
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mp_init(); // collect info about this machine
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bcpu = mp_bcpu();
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lapic_init(bcpu);
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cprintf("\ncpu%d: starting xv6\n\n", cpu());
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pinit(); // process table
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binit(); // buffer cache
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pic_init(); // interrupt controller
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ioapic_init(); // another interrupt controller
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kinit(); // physical memory allocator
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tvinit(); // trap vectors
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fileinit(); // file table
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iinit(); // inode cache
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console_init(); // I/O devices & their interrupts
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ide_init(); // disk
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if(!ismp)
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timer_init(); // uniprocessor timer
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userinit(); // first user process
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// Allocate scheduler stacks and boot the other CPUs.
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for(i=0; i<ncpu; i++){
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cpus[i].stack = kalloc(KSTACKSIZE);
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*(void**)(cpus[i].stack + KSTACKTOP) = 0;
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}
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bootothers();
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// Switch to our scheduler stack and continue with mpmain.
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asm volatile("movl %0, %%esp" : : "r" (cpus[bcpu].stack+KSTACKTOP));
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mpmain();
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}
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// Additional processors start here.
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static void
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mpmain(void)
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{
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cprintf("cpu%d: mpmain\n", cpu());
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idtinit();
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if(cpu() != mp_bcpu())
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lapic_init(cpu());
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setupsegs(0);
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asm volatile("movl %0, %%ss" :: "r" (SEG_CPUSTACK << 3));
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cpuid(0, 0, 0, 0, 0); // memory barrier
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cpus[cpu()].booted = 1;
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popcli();
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scheduler();
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}
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static void
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bootothers(void)
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{
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extern uchar _binary_bootother_start[], _binary_bootother_size[];
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uchar *code;
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struct cpu *c;
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// Write bootstrap code to unused memory at 0x7000.
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code = (uchar*)0x7000;
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memmove(code, _binary_bootother_start, (uint)_binary_bootother_size);
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for(c = cpus; c < cpus+ncpu; c++){
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if(c == cpus+cpu()) // We've started already.
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continue;
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// Fill in %esp, %eip and start code on cpu.
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*(void**)(code-4) = c->stack + KSTACKTOP;
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*(void**)(code-8) = mpmain;
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lapic_startap(c->apicid, (uint)code);
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// Wait for cpu to get through bootstrap.
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while(c->booted == 0)
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;
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}
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}
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